Valve mechanism



Filed Nov. l0, 1933 lNvENTOR LK-ZZ Patented Sept. 1, 1936 PATENT oi-FicsvALvE MECHANISM i Samuel Logan Kerr, Philadelphia, Pa.,assignor VtoBaldwin-Southwark Corporation, a corporation of'Delaware ApplicationNovember 10, 1933,` Serial No. 697,51l

4 claims. (ci. isn-139)` l5 ner and outerstationary; casings spacedtoform anannular fluid passagewaymwhile' a movable plunger has telescopicrelation to. the inner casing to form an internalfluid chamber- ,adaptedto cause a closing fluid pressureforce von the plung- Q) Ier.Openingchambers mayvbeprovidedinvarious forms but in any eventtheinternal chamber preferably has communication with theffluidwaythrough asuitable'opening in the plunger face. Specifically a singlecentral openingisA shown in `the formY ofa pilot valve controlledorifice,

although if it is necessary toemploy several openings, then each of thesame may'be-providedwith my improved arrangement. *if i l f In normaloperation of theplungervalve, uid

ows'fpast the'plungerorice in a downstream direction whereby uid fromthe internal chamber may be eifectively discharged to the uidway. Ifreverse flow should occur in the pipe line, then water would normallyenter this orifice and tend to build up pressure within the internalchamber. Under certain circumstances it is desirable to avoid having thereverse flow build up pressure in the internal chamber and also it isdesirable upon reverse `flow to have the same conditions for dischargeof water from the internal chamber to the uidway as is present duringnormal flow.

It is one object of my invention to provide improved means whereby avalve operating chamber may have substantially the same operativerelation to the uidway for either direction of fluid flow therethrough.

In one aspect of the invention, a communi- -cating passage between thevalve chamber and fluidway is provided with an auxiliary passage osetfrom the communicating passage so that the uid ow in either directionthrough the auxiliary passage will have the same eifect on 55 thecommunicating passage whereby it may d ischarge with equal facilityunder either direction of iiuidV ow in the pipe line.

Specifically, IV provide a deflector over the end of the plunger oricein spaced relation thereto but otherwise forming a'smooth continuationof 5 the plunger nose, thereby providing a lateral passage from theplunger orifice whereby the fluid iiow in either direction past thislateral passage will have' the same effect. This function is augmentedby providing an annular member 10 tapering .inwardly froml each endtoward a point adjacent said lateral passage thereby to provide aVenturi eiect in either direction of uid flow therethrough so Vastovproduce a pressure drop `at-the lateral passage. This will facilitate15' discharge of pressure fromthe internal chamber in either directionof oW. I

Otherv objectsand `advantages will be more apparent-toV those skilled inAthe art from the following description'of the accompanying draw- 20 inginvwhich: `1

, Fig; `1 is a` longitudinal section through one -form of valveshowing'one application' of my invention; "Z1 .I l c Fig. 2 'isafragmentary view..of a modification 25 showing my inventionV applied-.toa plungervalve havingone or more orifices `in the face of the 'plungerrather than atthe nose thereof.

In the illustrated-embodiments of the' invention. whichfare 'shownfherein merely for the pur.- 3'0 pose of disclosing one specific formamong possible others that the invention might take, I have provided aLarner-Johnson type of valve having an outer stationary cylindricalcasing I provided with coaxial inlet and outlets 2 and 3. An inner 35stationary cylindrical casing I is support/ed by suitable ribs in spacedrelation to casing Il to provide an annular fluid passageway 5. Aplunger 6 is telescopically disposed in casing 4 to provide an internalchamber 'I. A second chamber is 40 also preferably provided by anannular pistonlike flange 8 thereby forming an annular chamber 9 whichmay have communication with the uidway either by usual leakage at thejoint IIJ or by an external pipe depending upon the particularV purposefor which the valve may be used.

The plunger is provided with a closed face II having a nose orifice I2normally controlled by a pilot valve I3. This valve is provided with avalve stem so as to be moved relative to orifice I2 as by a rack andpinion I4. A pinion shaft I4', extending outwardly through the valvecasing I, carries an external second pinion I5 rotated by rack I5 whichis actuated by any suitable external 55 Y operation yby usual compriseo-ne or more blades of any suitable cross-f4V l l section. Supported inspaced relation to the plunger nose, as by a series of straight radialribs- I9 and 20, is a circular member 2| of gradually decreasingcross-sectional area from each-end thereof to a point where a throat 22'is formed in the general locality, of passage I8. Depending uponcircumstances, thisjthroat may beplaced in the same plane as passage I8or offset there-v from, but in either case it is seen that irrespectiveofthe direction -offlow through the valve a Venturi action is createdadjacent lateral passage I8 and hence fluidi pressurefin'internalchamber 'I may be eiectively discharged ineither direction 'of vfluidiiow through the pipe-line. Hence the valve is susceptible to veryaccurate and fpositive manual or `automatic control devices.

Fluid ypressure may be `normally suppliedto'the internal chamberthrough. passage?V 22,; and this pressureY may be discharged'through'fthef orifice I2 and ventur'r"2 I A iluidpassagev 23': may4conrmunicate with the annular :their-110eril.v` Passages 22'and 23 mayvrbe'controlled by eithermarruale ly -or automatically control-ledV valvesasis disclosed'invvarious patents heretofore-issuecl;`

In Fig. 2 the plungerisfpiovi'd'edwith'aparti tior125ftoV forma small'nose.` chamber 2li'. J This chamber commurilcatesv with the'internalplimger chamber through*V a "pilot "valve" controlled orice 21corresponding to orice I2 in the-preferred .ings is providedwithachannel: forming member 3U. The' passageway of this channelaconverg'esfrom its oppositev open :ends toward the.` opening to provide a Ven-hui'eiect'iineither direction. .of

iluid iiowV past the opening' im the valve face,

. s thereby to lfa'l:;ilitate" 'discharge f of ."pres'suref from thesmall chamber in either direction of ow. It will of course be understoodthat the Venturi channel with its open ends extends in the direction ofow and that this channel member may be bolted to the plunger face or.cast integrally therewith if so desired.

While I have shown two speciiic forms of the invention, it will ofcourse be understood that the invention may take other -forms and thatthe elements thereof may be changed in various details and applied tovalves of diierent types and also used for different applicationswithout departing. from the spirit of the invention as set y forth inthe appended claims.

I claim :l

way and a movable valve element for controlling said passageway, meansproviding a fluid cham Y15 1. A valve mechanism having a `fluidpassageber for., the valve, means providing communication `between saidchamber and passageway, and m-eansentirely movable WithY saidvalve'ielement te 'provide a Venturi passagesfor said communi'- eatingmeans in'either direction of uid flow through said passageway, I. 1 li2'. A valvemechanismy having a iluid passage` way andi-a movableva'lve:element therein; a iluid chamber for saidsva'lve element; a passagemov'- able' with .saidz 'element and communicating with said-s chamber'and passageway, Vand a Venturi elemen,Y entirely .movablei with said'valvefelement yamil.associated withsaidpassage 4in spaced relationvthereto: "tomaintain' af relatively low pressure l adj acentthe same in'eitlierl =directin of'iiuid'lilnwfthrough said'valve. l! 3f A.;plungertype valve adapted 'when'-'in'?norl msnen;` positionto'f'have asubstantiallyfee -flow passageway, anf'oriiice 'in `the nose" of Asaidpllmgergand'imeans movable entirely withsaid plunger: `for effecting 'atrelatvelyf l'ow pressure adjacentsaidoriiefin either direction offu'idowthrough said1va1ve.f l

er'providedfwith alnose; a pilotf'walve-ontrolled lphmgeaamines.fmsaidino'sve. lsaid orin'ce'termiinaztng in ailateral passage;andmeansv'encircling -theendof said' plunger noseafd'jacent said lateralypassage toperm'it 'discharge' of fluid through said orice in eitherdirectoiii'efiluid Ailo'w 'through said'. valve-f'mechanism. I"''lSAMU'ELiLOGN KERR.

